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A Petrarchan sonnet consists of an octave and a sestet. The rhyme scheme is usually abbaabba...
A photoelectric cell is apparatus that we use to demonstrate that light can liberate electrons...
A promoter is a substance that improves the efficiency of the catalyst in the reaction.
A radical is a very reactive atom or group of atoms with an unpaired valence electron.
A recursive formula uses the previous terms of a sequence to compute further terms in the...
A relative pronoun is a pronoun that does the work of a conjunction. A relative pronoun join two...
A relative pronoun is a pronoun that does the work of a conjunction. A relative pronoun join two...
A review is critical examination of work such as a play, art exhibition, book or other art work...
A review is critical examination of work such as a play, art exhibition, book or other art work...
A river that is graded has a sufficient gradient to ensure the flow of the river.